Differential thermal analysis has been carried out on AgGaS2 samples in order to investigate the relationship between the superheating of the melt and the supercooling behaviour of the material leading to an improvement of crystal growth conditions. The knowledge gained will be correlated to the crystal growth experiments which had been carried out by using the gradient freezing method.
, has been studied by the method of statistical thermal analysis (STA). It is shown that the melting temperature of solid
phase (Tm) increases non-monotonic from 970 °C due to rise in the preliminary melt overheating, and Tm reaches asymptotically 1010 °C. The equilibrium melting-crystallization temperature (
) has been defined as 989.2 °C. It is also found an extreme dependence of the melt supercooling on its overheating. The two
curves of irregular dependence of nucleation rate on melt supercooling have been plotted at different melt overheating.